blob: bde026facddb11309aa842fe7ae940f988d95dba (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <assert.h>
#include "bkpdata.h"
#include "registers.h"
#include "system.h" /* enum system_bbram_idx */
#include "task.h"
uint16_t bkpdata_read(enum bkpdata_index index)
{
if (index < 0 || index >= STM32_BKP_ENTRIES)
return 0;
if (index & 1)
return STM32_BKP_DATA(index >> 1) >> 16;
else
return STM32_BKP_DATA(index >> 1) & 0xFFFF;
}
int bkpdata_write(enum bkpdata_index index, uint16_t value)
{
static struct mutex bkpdata_write_mutex;
int use_mutex = !in_interrupt_context();
if (index < 0 || index >= STM32_BKP_ENTRIES)
return EC_ERROR_INVAL;
/*
* Two entries share a single 32-bit register, lock mutex to prevent
* read/mask/write races.
*/
if (use_mutex)
mutex_lock(&bkpdata_write_mutex);
if (index & 1) {
uint32_t val = STM32_BKP_DATA(index >> 1);
val = (val & 0x0000FFFF) | (value << 16);
STM32_BKP_DATA(index >> 1) = val;
} else {
uint32_t val = STM32_BKP_DATA(index >> 1);
val = (val & 0xFFFF0000) | value;
STM32_BKP_DATA(index >> 1) = val;
}
if (use_mutex)
mutex_unlock(&bkpdata_write_mutex);
return EC_SUCCESS;
}
int bkpdata_index_lookup(enum system_bbram_idx idx, int *msb)
{
*msb = 0;
#ifdef CONFIG_USB_PD_DUAL_ROLE
if (idx == SYSTEM_BBRAM_IDX_PD0)
return BKPDATA_INDEX_PD0;
if (idx == SYSTEM_BBRAM_IDX_PD1)
return BKPDATA_INDEX_PD1;
if (idx == SYSTEM_BBRAM_IDX_PD2)
return BKPDATA_INDEX_PD2;
#endif
return -1;
}
uint32_t bkpdata_read_reset_flags(void)
{
uint32_t flags = bkpdata_read(BKPDATA_INDEX_SAVED_RESET_FLAGS);
#ifdef CONFIG_STM32_EXTENDED_RESET_FLAGS
flags |= bkpdata_read(BKPDATA_INDEX_SAVED_RESET_FLAGS_2) << 16;
#endif
return flags;
}
__overridable void bkpdata_write_reset_flags(uint32_t save_flags)
{
bkpdata_write(BKPDATA_INDEX_SAVED_RESET_FLAGS, save_flags & 0xffff);
#ifdef CONFIG_STM32_EXTENDED_RESET_FLAGS
bkpdata_write(BKPDATA_INDEX_SAVED_RESET_FLAGS_2, save_flags >> 16);
#endif
}
|
